Question

I use the VPN HUB to connect multiple routers.
However, it is not possible to connect to all of them.

This is the set up I am using.

VPN HUB:
Server IP: 192.168.255.0
Server submast: 255.255.255.0

Device 1:
Rutx08 -> Router: 192.168.5.1, subnet 255.255.255.0, DHCP 192.168.5.2 - 19
Behind this 1 device with ip address: 192.168.5.21

Device 2:
Rutx09 -> Router: 192.168.5.1, subnet 255.255.255.0, DHCP 192.168.5.2 - 19
Behind this 1 device with ip address: 192.168.5.25

User 1:
Fixt ip 192.168.255.241 (this is a server that needs to contact the other devices)

I created the routes in the hub. and the LAN checked at the clients

Route info:
192.168.5.21 - 255.255.255.255 - Device 1
192.168.5.25 - 255.255.255.255 - Device 2

If I'm on User 1's Server, I can find Device 1 (ping success)
But Device 2 is not reachable. (ping: Destination port unreachable)

Now I want to connect many more routers to the VPN HUB in this way, so I would like to know what I am doing wrong.

Answer 1

Hi,

This is a IP conflict/routing issue. Your RUTX08 and RUTX09 use identical subnets - 192.168.5.0/24, for DMVPN configuration with multiple spokes you need to place each router into unique subnet, e.g.:

VPN HUB 192.168.255.0/24 - OK

RUTX08 Spoke1 192.168.5.0/24 - OK

RUTX09 Spoke2 192.168.5.0/24 - Not OK because this subnet is already used by RUTX08, change it to another subnet e.g.: 192.168.6.0/24

edit: I've noticed that you've mentioned that there are 192.168.5.21/32 and 192.168.5.25/32 routes so in theory that should be ok. To determine cause of the issue could you download troubleshoots from your RUTX08/09 System -> Administration -> Troubleshoot and PM it to me?